refactor constraints_handler module and fix init corner case

v4.0.0

v3.4.0

v3.3.0

v3.2.2

v3.2.1

v3.2.0

v3.1.0

version 3.0.3

fix args bug in interfaces.OOOptimizer.optimize

version 3.0.2

fixed two problems with EvalParallel2